Introduction

In this tutorial you will check the quality of your signal and examine the artifacts that may reside in your recording. In this tutorial it is assumed you already connected a participant!

First select the EEG SETUP that you are currently using

Trouble shoot a PSYPHY recording

PSYPHY RECORDING

Use this signal check pipeline when you have a participant hooked up and you are ready to record using your PSYPHY EEG setup.

In this tutorial you will check the quality of your signal and examine the artifacts that may reside in your recording.

START your PSYPHY recorder and name your file

What Happened?

NO CONNECTION

Nothing happened in the PSYPHY recorder.

	SELECT The Situation	Diagnosis	Solution
1	Nothing is happening	File is still loading	Just wait a minute or 2
2		Still nothing is happening	Check if PSYPHY Amp is 'ON'.
3
4
5	None of the above	HELP!	Contact the assistant

Now the recording should start

PSYPHY RECORDING STARTS

PSYPHY Recording Starts.

	SELECT The Situation	Diagnosis, Step by step, in order!	Solution
-1-	ALL channels are bad	Yellow ground electrode and/or blue reference electrode are not connected.	Connect Ground and reference electrodes.
		Yellow ground electrode and/or blue reference electrode are not gelled.	GEL Ground and/or reference electrodes.
		Yellow ground electrode and/or blue reference electrode are not plugged into the proper slots in the electrode box.	Push Plugs in properly.
		No Gel in any other recording electrodes.	GEL all electrodes, make sure no air is trapped between the gel and the skull.
		ALL Electrode Plugs not properly connected to Electrode box.	Push Plugs in properly.
		Still none of the recording electrodes work.	Check if the plugged recording electrodes are actually the ones you show on the screen.
		Still none of the recording electrodes work.	Change the Yellow grond and/or the Blue reference electrode.
-2-	A few recording channels are bad, the rest is okay!	Ground and reference electrodes work, some recording electrodes don't.	GEL the faulty recording electrodes.
		Still, a few recording channels are bad, the rest is okay!	Check if the plugged recording electrodes are actually the ones you show on the screen.
		Still a few recording electrodes don't work properly	Push Plugs of faulty electrodes into the GammaBox
		Still a few recording electrodes don't work properly	Change the electrode (s) in question

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Trouble shoot a gTEC recording

gTEC RECORDING

Use this signal check pipeline when you have a participant hooked up and you are ready to record using your gTEC EEG setup.

In this tutorial you will check the quality of your signal and examine the artifacts that may reside in your recording.

PRESS START in the EEG_Recorder Window.

What Happened?

NO CONNECTION

No Connection with the MobiLab.

	SELECT The Situation	Diagnosis	Solution
1	The MobiLab is not plugged in	Cable is not connected	Press Clear, Plug MobiLab in, Press Start
2	The MobiLab is not switched ON	The MobiLab is not switched ON	Press Clear, Switch MobiLab ON, Press Start
3	The MobiLab is switched ON but LED is blinking red	The MobiLab batteries are dead	Press Clear, Change MobiLab Batteries, Press Start
4	The MobiLab is switched ON and LED is blinking green	Driver issue	Restart Matlab and EEG_Recorder and try again
5	None of the above	HELP!	Contact the assistant

Now the recording should start

RECORDING STARTS

Recording Starts.

	SELECT The Situation	Diagnosis	Solution
1	ALL channels are bad	GammaBox is still OFF	Switch GammaBox ON
		GammaBox is ON but no Green light	Change the battery for the GammaBox
		Yellow ground electrode and/or blue reference electrode are not connected	Connect Ground and reference electrodes. Dont forget the GEL
		No Gel into red recording electrodes	GEL all electrodes, make sure no air is trapped between the gel and the skull
		ALL Electrode Plugs not properly connected to GammaBox	Push Plugs in to the hilt
		Still none of the recording electrodes work	Change the Yellow grond and/or the Blue reference electrode
2	A few channels are bad, the rest is okay!	Ground and reference electrodes work, some recording electrodes don't.	GEL the faulty recording electrodes
		Still a few recording electrodes don't work properly	Push Plugs of faulty electrodes into the GammaBox
		Still a few recording electrodes don't work properly	Change the electrode (s) in question

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Tuning your signal

Fine Tuning your Signal.

During the recording, your EEG signal can become contaminated by sources other than from the brain, such as the mains grid (our electricity network), all kinds of muscle tension artifacts and various other interferences. The first produces a high-amplitude 50 Hz artifact (60 Hz in the USA), often ‘repeated’ at the multiples of the frequency (at 100 Hz, 150 Hz and so on). Furthermore, low frequency drifts can obscure your data.

The first step in getting a clean recording is to get rid of these contaminations. There are a few ways to do this.

Discuss with your teaching assistent how to get the best results.